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The leftover urine that drips onto the pants or shorts after zipping up, giving the impression that one has pissed himself, or the water from a faucet that somehow ends up on said parts. Runoff is commonly hidden or removed by wearing long shirts or utilizing the hand-dryer while no one is around.
Bill: Oh hey man looks like you just pissed your pants!

Sven: F*** runoff!
runoff by Waldosziak May 24, 2012

Rasofficial 

"Yo that Justin Bieber song is OFFICIAL."
"Is it Rasofficial?"
"Yes, it most certainly is."
Rasofficial by Mambarr Drewski December 27, 2011

Hipster Runoff 

Probably one of the best blogs on the internet, because it's a bunch of hipster hating hipsters, and they're cool because they can take a little joke about themselves,

Made by Carles, but no one really knows who Carles is, a girl or a guy, old or young, etc. We don't know.
Hey did you hear about how Best Coast insulted Hipster Runoff ?

anal runoff 

Sperm that leaks out of an anus that has just been ejaculated into.
Alisha's pregnancy is a result of anal runoff.
anal runoff by anusbeed April 2, 2010

Boner Runoff 

The water that drips off your boner when you're taking a shower.
I held the boner runoff in my hands but it just slipped through.
Boner Runoff by xxJack May 16, 2008

crackwhore runoff 

any type of fluid that streams freely from the loins of an unscrupulous woman whos hobbies include smoking cocain that has been cut with baking soda
don't let her in the car, she might leave a snail trail of crackwhore runoff
crackwhore runoff by David Scroggins February 23, 2009